Shore jack



Sept- 11, 1956 s. HOLMBOE, SR 2,762,605

SHORE JACK 2 Sheets-Sheet l Filed Jan. 18,-1954 7 R. .||||l.|.||| Z wf. V, N E E M a. W m I T A l d 2 w l f `.IIIIIP l 2 W IIIIIIIIIJ v v v u f m Sept 11, 1956 L.. s. HOLMBOE, SR 2,762,605

SHORE JACK 2 Sheets-Sheet 2 Filed Jan. 18, 1954.

sHoRE JACK v Lawrence-S. :Holmboe,-.Sr., Oklahoma City, Okla. Application January/"1s, 1954,senatNaftoitazitA 2 Claims.' (Cl. 2'54-`120) The vpresent invention 'relates vto an improvement Ain shore jacks, and more vparticularly to shore jacks 'for use in shoring, bracing', jacking and scaffolding, .as used Aordinarily in general construction work. .It can'be .used as well in Aconnection with buildings and reinforced concrete structures .of all kinds, in connection with` mines,

in connection Ywith ybraces for sewers and other trenches, in connection with sc'affolds and vhoist towers, and vin connection with like uses where such a-member Yis desireld.

lThe present invention is an improvement upon my device as shown 'in my Patent-No. 2,178,792, issuedNovember 7 1939, for a Shore Jack. The primaryy objection p and the like.

Another object is to provide "a jacking devicefw'ith 'an attaching shoring protector that is always in place and ready for .its intended use.

Another object is to provide an alternate embodiment of a shore protector for a jacket device that may be placed in position for use when needed to protect the shore and that may be comparatively cheaply manufactured and added to shoring jacks already in use.

Other objects will be apparent from the following description when taken in conjunction with the accompanying two sheets of drawings, wherein:

Figure 1 is a perspective view of the improvement per se;

Figure 2 is an elevational view of the device on a shoring jack in position on a shore as shown in dotted lines, and showing in dotted lines the lifting action of the jack and the device;

Figure 3 is a plan view of the device on a shoring jack;

Figure 4 is a n'ght side view of the device as seen in Fig. 2;

Figure 5 is a perspective view of an alternate embodiment of the device per se;

Figure 6 is an elevational view of the alternate embodiment of the device on a shoring jack in position on a shore as shown in dotted lines, and showing in dotted lines the lifting action of the jack and the alternate embodiment of the device;

Figure 7 is a plan view of an alternate embodiment of the device on a shoring jack; and

Figure 8 is a right side view of the alternate embodiment of the device as seen in Fig. 6.

Like characters of reference designate like parts in those figures of the drawings in which they occur.

United States Patent() i :In vthe drawings: The reference .numeral 1 designates the lower rone-of a pair of shore members, and numeral 2 designates the rlower-.end portion of the upper one, both fitting together .and .adapted to slide longitudinally with relation to each j numeral .#5, .having a body 6 with perpendicularly 'outstanding arms 7 and 8. The arms 7 and 8.a.re provided with kpivot pins 9 and 10 for holding in :connection with cotter keys gripping plates 1.1 and 12, respectively. l0n

. -rone of .the arms, preferably arm 7, is an .upsta'nding boss 13., fhaving a .perpendicular extending pivot pin :14. Pivotally attached-on said pin 14, by a Vcott'er-key 15, is a-lever .16 4having an eccentric or cam `head 17 .the outer edge of Vsaid .cam .17 at right angle to thelever :16 presents a vtransversely .tiat surface, `as .best :shown at A18, Figs. 4

and 8.

The .above description of the yjacket Vdevice is fully covered by my patent .mentioned hereinabove, and is presented here only to show a workable .device :in con- `nection with the present invention.

Reference numeral -20 indicates, fas a who1e,a;pressure ;p1ate..havinga ysubstantially square body r21 and :an "upwardly arcuate .upper surface 22. However, the top `sur- .face 22 of plate 20, if desired, may be made flat in configuration. To the lower surface ofthe body 21.is. rigidly attached a spaced ,parallel pair of dependingstrip metal legs '23 .and 24, positioned edgewise longitudinally with the .arcuate Vsurface '22. The spacing of the rlegs 23and 24 'is 'Such as to .freely receive thecam portion '17 of the lever 16. The legs 23 and 24 are .through pierced bya "pair 'of Yco-opera'ting''longitudinally extending slots 25 and 2 6, respectively. Each slot 25 and 26'has a width sui- "c'ient to 'freely 'receive vand pivot on the pin "I4, .and a length great enough 'to permit the 'c'am ihead '17 to raise the body 21 to the uppermost part of the cam arc. The plate 20 is placed upon the cam head 17 with the legs 23 and 24 straddling the cam head and the pivot pin 14 through the co-operating slots 25 and 26, and is held in place on the pin 14 by the cotter pin 15, Figs. 2 and 4. The body 21 is held in substantially a horizontal position by an upstanding lug 27 upon the uppermost part of the boss 13, Fig. 4. The lug 27 is substantially rectangular in general configuration, lying longitudinally parallel with and disposed vertically above the pin 14, and having a width somewhat narrower than the slot 26, as shown in dotted lines, Fig. 3. The lug 27 extends longitudinally with the pin 14, within the slot 26, past the free edge of the arm 7, a distance substantially equal to the thickness of the leg 24. Thus the plate 20 may pivot or rock upon the pin 14 only to the extent that the sides of the lug 27 will allow the movement of the slot 26 thereupon.

Operation The jacking device 5 is placed upon a shore 1, with the lever end 7 under the upper shore, as shown in Fig. 2. In this position the arcuate surface 22, of the pressure plate 20, is adjacent the lower end of the upper shore 2. The lever 16 is raised, as shown by the dotted lines in Fig. 2, and the transversely flat surface 18, of the cam head 17, contacts the lower surface of the pressure plate body 21, forcing it upwardly against the lower end of the shore 2. The purpose of the arcuate surface 22 is to insure a substantially transverse flat contact with the lower end of the shore 2, to prevent damage thereto. It is possible to lift approximately three thousand pounds with the jacking device 5 and therefore it is believed quite evident that some means such as the present improvement such pressure.

An alternate embodiment of the dev-ice is shown in Fig. 5, and is indicated, as a whole, by the reference numeral 30. This alternate'embodiment is a substantially at rectangular plate, having one end of a comparatively short handle 31 rigidly attached transversely across the left end of the plate, as seen in Fig. 5, and extending outwardly and laterally from the plate 32. The plate 32 .is of alength sufficient to substantially extend across the bottom end of the shore 2, and a width great enough to yextend from the back, or right hand side, as seen in Fig. 6 of the shore 2, along the bottom of the shore toward the shore 1, to provide a bearing surface'for the at vportion 18' of the cam head 17. A comparatively short rectangular bar'33 is rigidly attached, as by welding,

.. at a selected point between the ends of the longitudinal sidel ofthe plate 32 adjacent the free end of the handle '.31 perpendicular to the plate 32, andvextending slightly upwardly above its upper surface. -.similarly attached to the end of the plate 32` adjacent A lsimilar barA 34 is the rigid Vendlof the handle 31. The alternate plate 30 is attached to the jacking device 5 by a suitable length of chain 35, having one end rigidly attached, as by weld I ing, to the end of the lplate 32 'adjacent the rigid end of 'fthe handle and the opposite end attached to the eye of the cotter pin 15.' I

The purpose of the alternate embodiment 30 is identical with the purpose of pressure plate'20, Fig. 1, and the operation is similar except that the plate 30 must be positioned upon the cam surface 18, contacting the lower surface of the upper shore 2, by the operator. The operator grasps the handle 31 and places the upper surface ofthe plate,32 adjacent the lower surface of the shore 2 with the bars 33 and 34 contacting the back or right i side and near side of the shore 2, as seen in Fig. 6, and

` asmore clearly illustrated in Fig. 8. When the plate 30 has been positioned, the handle 16 may then be raised, f lifting the shore 2 the desired amount.

Obviously the invention is susceptible to some change or alteration without defeating its practicability, and I i therefore do not wish to be confined to the preferred embodiment shown in the drawings and described herein,

further than I am limited by the scope of the appended claims.

I claim:

l. In combination with a shoring jack including, a rigid U-shaped frame adapted to embrace a shore member, substantially at gripping plates connected co-operatively to the arms of the U frame for gripping opposite sides of the Shore member, load-lifting means supported by the U frame, said lmeans including' a cam lever pivotally connected toone end of said frame: a at surfaced rectangular pressure plate, said plate having a rigid handle projecting outwardly in angular relation from one end of the plate; a pair of short upstanding bars rigidly carried by said plate `at said one end and at one side edge, respectively, for contacting the sides of a shore and positioning the plate between said camand the shore; and flexible means connecting said plate to said U frame.

2. In combination with a shoring jack including, a rigid U-shaped frame adapted to embrace a shore member, substantially ilat gripping plates pivotally connected co-operatively to the ar-ms of the U frame for gripping opposite sides of the shore member, load-lifting means supportedby 'the frame adjacent to one of the arms of the U frame tending to tilt the frame and gripping plates; a at 'surfaced rectangular pressureplate, said plate having a Ltrigid handle projecting outwardly in angular relation from one end of the plate; a pair of short bars rigidly carried perpendicularly by said plate at said one end at one side edge,

positioning the plate between said load-lifting means and the lower end of a shore; and a chain connecting said l plate'to'said U frame.

References Cited in the le of this patent UNITED STATES PATENTS 1,797,616 Martin Mar. 24, 1931 1,832,394 Holmboe Nov. 17, 1931 1,911,705 McMullan May 30, 1933 Holmboe Nov. 7, 1939 

